SIMULIA リソース・センター

When simulating bolts, the amount of detail to include is often raised. The analyst is left with using judgment in deciding to include or not include details, such as threads. For system models, where the primary bolt function is to transfer load from the cover to the base, thread details are sometimes perceived as not needed. It is believed that a reasonable result can be achieved without this detail. This paper evaluates boundary conditions and software settings used in simulating bolts. A simulated threaded bolt with full contact is the baseline model. A model with interaction, smear, at the threaded region and one with tied contact at the threaded region is compared against the baseline model.

Customer Papers

In the past several years, Abaqus, the leading edge of the implicit method, has added the explicit method to its line-up. Consequently, the ability to solve highly nonlinear problems, especially for two of them, i.e., geometric nonlinearity and boundary condition nonlinearity, has been extensively improved. However, as for material nonlinearity, the issue of defining the constitutive law unresolved. This is due to the fact that this issue may not be resolved solely by using FEM capabilities, but rather may be deeply involved with the management of FEM.

Customer Papers

Stents have been used in the treatment of coronary artery disease for decades, and their use in the peripheral arterial vasculature is growing rapidly. Mechanical loads imposed on peripheral stents may include loads due to arterial pulsation, axial compression, bending and torsion. These stents are most often manufactured using nitinol, a nickel-titanium alloy that exhibits unique shape memory and superelastic characteristics. Finite element analysis can be a powerful tool in designing medical devices to withstand such a rigorous loading environment. This paper will focus on the use of Abaqus/Standard for fatigue life characterization of nitinol stents and comparison of performance predicted by FEA to experimental data.

Customer Papers

Roller bearings are an integral part of the transmission system of a modern race car and their performance under arduous loading conditions needs to be assessed. The local distribution of contact pressure on the bearing surface can have a significant effect on the wear and durability of component parts, and simulation using finite element analysis methods form an important part of the design process. In this study, ABAQUS/Standard was used to examine the Hertzian contact stress in two-dimensions before extending the study to three-dimensional models. Further studies using a global model revealed the sensitivity of the design to the shape and strength of the bearing surface and to the number and size of rollers used.

Customer Papers

In order to accurately calculate the stresses in Multi-Layer Steel (MLS) head gasket durability analysis, the normal and relative shear motions between cylinder head and gasket, gasket and block, as well as between gasket layers have to be comprehended in the analytical model. In this study, an analytical method was developed to effectively calculate the MLS head gasket stresses during engine operating condition. In the analysis model, each layer of the MLS head gasket is modeled using GASKET element, developed by ABAQUS, and the GASKET element layers were stacked together according to the configuration of the head gasket.

Customer Papers

This report concerns the Finite Element modeling of a complete Formula One car wheel group. The main goal of such a model was to develop a design tool for wheel ball bearing optimization, both in terms of their layout and their dimensions. The project was a collaboration with the bearing manufacturer with the goal of best performance in conjunction with best reliability.

Customer Papers

Mercury Marine outboards, engines, and drives are designed to withstand indoor impact testing (called “logstrike”) that simulates a collision with an underwater object. This test is comprised of an outboard or sterndrive device mounted on a mock boat that collides with a simulated log. This newly developed method is beginning to support product development programs and assist Mercury Marine engineers in designing components with more knowledge about the loads they must withstand. The method also enables the evaluation of designs without the need for physical parts.

Customer Papers

The investigation to obtain the cutting force coefficients has been carried out over the past two decades by many researchers. However, the outstanding disadvantages of voluminous experimental data acquisition and its analyses still exist. This paper demonstrated the use of an efficient and accurate numerical tool ( i.e. FEA), in simulating the cutting process and determining the cutting force coefficients. In this approach, an Arbitrary Lagrangian Formulation (ALE) was employed in the FEM simulations. This formulation has been gaining more recognition in structural analysis for its combined advantages of both Lagrangian and Eulerian formulations in a single model. Cutting force predictions using evaluated coefficients are shown to perfectly match experimental results.

Customer Papers

In order to match the more stringent 2007 Environmental Protection Agency (EPA) emission standards, the need for more robust and refined exhaust gas treatment has been recognized by the heavy duty engine manufacturers. This led to the conception of a breakthrough technology in the engine exhaust gas treatment by one of the World’s leading heavy duty engine manufacturer. The soul of this technology is vested in the Exhaust Gas Regeneration Unit which comprises of various intricate components along with a network of fuel, coolant and air ducts, and distribution head fittings. A prime challenge in the development of a successful design was to come up with a robust routing of these ducts which consisted of various combinations of Hard lines and Flex lines along with compatible end fittings.

Customer Papers

In contrast to frontal crash, the occupant sits directly in the deformation zone of the vehicle structure during a side impact event. The goal in occupant protection is not one of restraining the occupant relative to the interior of the vehicle but one of protecting the occupant from the high energies of the intruding surface. This paper describes a study undertaken to establish a means of dynamically validating a typical finite element seat model used in the virtual development of side impact protection systems at BMW.

Customer Papers

One major benefit of using a 3D injection molding simulation is the capability to simulate the fiber orientation and the anisotropic warpage, with the option, to transfer the material properties to structural mechanical analysis. With this option, it is possible to reduce the over dimensioning of fiber reinforced parts and thus resulting in substantial savings of mass, material and costs .This work will demonstrate the benefit of FEM combined with injection molding simulation but also the risks that can occur.

Customer Papers

While nonlinear FEA of rubber or elastomer components is quite common today, there is still some uncertainty in modelling choices and representations. Material modelling choices, curve fitting from material test data, etc., have been discussed in many papers, but some fundamental issues of element selection and mesh discretization for nearly incompressible and fully incompressible materials are less discussed

Customer Papers